<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body style="margin: 0">
    <!--<div style="height: 48px;background-color: blue;position: fixed;top: 0;left: 0;right: 0"></div>-->
    <!--<div style="height: 1000px;margin-top: 48px">12345555</div>-->
    <!--position和absolute联用-->
    <!--<div style="height: 500px;width: 500px;border: 1px solid;position: relative">-->
        <!--<div style="height: 50px;width: 50px;background-color: blue;position: absolute;right: 0;bottom: 0"></div>-->
        <!--<div style="height: 50px;width: 50px;background-color: blue;position: absolute;right: 0;top: 0"></div>-->
        <!--<div style="height: 50px;width: 50px;background-color: blue;position: absolute;left: 0;top: 0"></div>-->
        <!--<div style="height: 50px;width: 50px;background-color: blue;position: absolute;left: 0;bottom: 0"></div>-->

    <!--</div>-->

    <!--<div style="height: 100px;width: 100px;background-color: aqua;position: absolute;top: 100px;left: 100px;"></div>-->
    <!--<div style="height: 1000px;margin-top: 48px"></div>-->

    <!--<div style="height: 100px;width: 100px;position: relative">-->
        <!--<div style="height: 100px;width: 100px;background-color: blue;z-index: 1;position: absolute"></div>-->
        <!--<div style="height: 100px;width: 100px;background-color: red;z-index: 2;position: absolute"></div>-->
    <!--</div>-->
    <!--<input value="login" type="button" style="cursor: crosshair">-->
    <!--自动增加滚动条-->
    <!--自动截取-->
    <!--<div style="height: 1000px;width: 1000px;overflow: hidden">-->
    <!--要求出现滚动条-->
    <!--<div style="height: 100px;width: 100px;overflow: scroll">-->
        <!--<img src="1.jpg">-->
    <!--</div>-->
    <!--图片堆叠-->
    background-image 背景图
    background-repeat 控制堆叠
            no-repeat 不堆叠
            repeat-x 横向堆叠
            repeat-y 纵向堆叠
    <div style="height: 1000px;width: 100%;background-image: url('https://www.autohome.com.cn/images/error/bg.png');background-repeat: repeat-x"></div>
</body>
</html>